Malbec needs macOS 26.5 or later
Update macOS in System Settings › General › Software Update, then open Malbec again.
What happened
Malbec needs macOS 26.5 or later, and this Mac runs an older version.
The fix
Click Open Software Update, install the update, then open Malbec again.
When to write to us
If this Mac can’t update to macOS 26.5, Malbec can’t run on it. If you bought a license, you can ask for a refund within 14 days.
Email support@malbec.app. For a diagnostics file, choose Help › Export Diagnostics… in Malbec and attach the zip it saves. It has no account details, and your home folder is masked.